He never thought a Destroyer could have such a big impact on the battle, and he now confirms they indeed don't have the means to deal with the Armor-Piercing class.
So there was no consideration in his mind of dealing with the Armor-Piercing class immediately.
Instead, he chose another strategy.
To engage in a direct head-on fight with the ships of the Sinda Corporation, exchanging pieces.
Just the few rounds of shooting by the Armor-Piercing had allowed the Commander to determine the cooldown time for the Armor-Piercing's large weapon was fifteen seconds. This seems short, but in the midst of battleship combat, it is somewhat long.
A fifteen-second vacuum period means that during this time, the Corporation's fleet has combat strength similar to before, and even less.
Because the fleet's other ships need to share the firepower for the Armor-Piercing, this is the only chance.
Honestly speaking.